package com.sgj.principle.liskov.improve;

/**
 * 里氏替换原则
 * @Author: Guoji Shen
 * @Date: 2021/11/10 9:06
 */
public class Liskov2 {
    public static void main(String[] args) {
        A a = new A();
        System.out.println("11 - 3 = " + a.func1(11, 3));
        System.out.println("1 - 8 = " + a.func1(1, 8));

        System.out.println("------------------------------------------");

        B b = new B();
        System.out.println("11 - 3 = " + b.func3(11, 3));
        System.out.println("1 - 8 = " + b.func3(1, 8));
        System.out.println("11 + 3 + 9 = " + b.func2(11, 3));
    }
}

// 创建一个更加基础的类
class Base {

}

class A extends Base{
    public int func1(int num1, int num2) {
        return num1 - num2;
    }
}

class B extends Base {
    // 此时 B 类想继续使用 A 类的方法，可以使用组合关系
    private A a = new A();

    public int func1(int a, int b) {
        return a + b;
    }

    public int func2(int a, int b) {
        return func1(a, b) + 9;
    }

    public int func3(int a, int b) {
        return this.a.func1(a, b);
    }
}